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tccgen: gen_cast: cast FLOAT to DOUBLE

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... to avoid precision loss when casting to int,
also when saving FLOATs to stack
This commit is contained in:
grischka 2016-10-14 10:44:57 +02:00
parent 3b84e61ead
commit f077d16c20
1 changed files with 9 additions and 0 deletions
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9
tccgen.c
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@ -811,6 +811,10 @@ ST_FUNC void save_reg_upstack(int r, int n)
#else #else
type = &int_type; type = &int_type;
#endif #endif
if ((type->t & VT_BTYPE) == VT_FLOAT) {
/* cast to DOUBLE to avoid precision loss */
type->t = (type->t & ~VT_BTYPE) | VT_DOUBLE;
}
size = type_size(type, &align); size = type_size(type, &align);
loc = (loc - size) & -align; loc = (loc - size) & -align;
sv.type.t = type->t; sv.type.t = type->t;
@ -2349,6 +2353,11 @@ static void gen_cast(CType *type)
vpushi(0); vpushi(0);
gen_op(TOK_NE); gen_op(TOK_NE);
} else { } else {
if (sbt == VT_FLOAT) {
/* cast to DOUBLE to avoid precision loss */
gen_cvt_ftof(VT_DOUBLE);
vtop->type.t = (vtop->type.t & ~VT_BTYPE) | VT_DOUBLE;
}
/* we handle char/short/etc... with generic code */ /* we handle char/short/etc... with generic code */
if (dbt != (VT_INT | VT_UNSIGNED) && if (dbt != (VT_INT | VT_UNSIGNED) &&
dbt != (VT_LLONG | VT_UNSIGNED) && dbt != (VT_LLONG | VT_UNSIGNED) &&